RIO GRANDE NAWQA

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USGS IN YOUR STATE

USGS Water Science Centers are located in each state.

Rio Grande Valley NAWQA Study Biological Activities

Activities by Year

Fiscal Year 1992

• Fish livers sampled for trace elements at 12 sites
• Whole fish sampled for organics at 11 sites
• Whole fish sampled for radionuclides at 10 sites

Fiscal Year 1993

• Ecological survey of habitat and population survey of fish, invertebrates, and algae at 10 sites

Fiscal Year 1994

• Repeated the ecological survey at 9 sites
• Conducted synoptic study of algae and invertebrates at 11 sites
• Conducted a study of trace element accumulation in aquatic moss

Fiscal Year 1995

• Repeated the ecological survey at 6 sites
• Conducted synoptic study of algae and invertebrates at 2 sites
• Conducted multiple-reach survey at 2 sites